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LAS VEGAS — The Miami Heat will not double-down in Vegas. The back-to-back NBA champs were seeking a Summer League title with a team whose roster is filled with young hopefuls that will not play for the 2013-14 Heat.

The only familiar face affiliated with the summer Heat has been that of coach Erik Spoelstra, who has watched the team perform from a front row seat throughout the week. Still, this Heat team deserves a lot of credit. Coached by assistant coach Dan Craig, a former Heat video assistant, just like Spoelstra used to be, Miami entered the inaugural Summer League tournament as the No. 18 seed and landed in the semifinal round.

But they seemed no match for the No. 3-seed Phoenix Suns, who feature three rotation players in P.J. Tucker, Markieff Morris and Marcus Morris, plus last year’s No. 13 pick Kendall Marshall and this year’s No. 29 pick Archie Goodwin. And new head coach Jeff Hornacek has been on the bench throughout the summer league.

The Suns led 60-40 midway through the third quarter before Miami’s James Nunnally (24 points), a D-Leaguer in Bakersfield last season, James Ennis (25 points, nine rebounds), a long-shot draft pick out of Long Beach State, D.J. Kennedy (18 points, six rebounds), who logged two games with Cleveland in 2011-12, and Eric Griffin, who played in Italy last season, rallied the Heat.

Nunnally’s 3-pointer with 3:51 to go put Miami ahead 84-83 and the Suns were getting burned to the point of embarrassment. It didn’t sit well with Tucker, who quickly jacked up the intensity.

“We weren’t losing that. We got too many roster players and we working too hard to get this done,” Tucker said. “Me, Markieff, Marcus, Kendall, we got way too many roster players on this team I feel like to be losing. So for me, it was a little personal at the end to try to really get the win.”

Tucker’s two free throws and then a jumper put the Suns up 89-87 with 1:07 to go as he looked over to the Heat bench and directed a few words their way. The Suns (6-0) held on to win it 91-89 and will face the top-seeded Golden State Warriors (6-0) in Monday’s championship game (9 p.m. ET, NBA TV).

The Warriors, led by roster players Draymond Green and Kent Bazemore, advanced with a 75-67 win over the No. 5 Charlotte Bobcats, who elected again to not play Michael Kidd-Gilchrist, Bismack Biyombo and No. 4 pick Cody Zeller.

Kidd-Gilchrist will stay in Vegas for the U.S. Men’s National Team training camp that runs Monday through Thursday. Both Zeller and Biyombo did not play in the last two games.

So Monday’s matchup will be a battle of unbeatens in the first Summer League championship game with the Warriors looking to make it 14 straight Summer League victories. And if you don’t think both teams — the Suns with their roster players and the Warriors with their winning streak — are taking this seriously, think again.

“It is for real for us,” said Bazemore, a leading MVP candidate who had a tough shooting going 4-for-12 for13 points, but also collected four assists. “We came out here and had a mini-camp where we were just working out, and we always look at each other like we work too hard to just get to a certain place and be satisfied. We always feel like we can win a game. We’re probably the best de-… well, we are the best defensive team here. Defense wins championships.”

Non-rookie of the day: Who else could it be other than the Suns’ Tucker, who finished with 19 points on 8-for-11 shooting, plus rebounds and two steals.

Other notables: The Suns’ Marcus Morris contributed 17 points on 6-for-9 shooting in 22 minutes, and Dionte Christmas had 10 points, three rebounds and three assists. Golden State’s Green put up a double-double after three quarters and finished with 15 points, 12 rebounds and four steals.

Rookie of the day: The Heat’s Ennis scored a game-high 25 points on 8-for-17 shooting in the two-point loss to the Suns. He also grabbed nine rebounds, an impressive six on the offensive glass, and had just two turnovers in more than 34 minutes of action.

Other notables: Big man Arinze Onuaku, a D-Leaguer last season in Canton, scored 10 points on 5-for-7 shooting and had four rebounds off the bench in just 14:40. Undrafted rookie Chris Babb out of Iowa State had nine points, four boards and four assists for the Suns in 17:42 off the bench. Miami’s Nunnally went 5-for-6 from 3-point range and was 8-for-12 overall coming off the bench for 24 points. Former Syracuse guard Brandon Triche played prominently for the Bobcats with 13 points and five rebounds off the bench and teammate Troy Daniels, undrafted out of Virginia Commonwealth, had 13 points and seven rebounds. Two-year D-League vet Cameron Jones had 16 points for the Warriors.

Coming up: The final day of the 2013 Las Vegas Summer League will see its inaugural title game pitting the Warriors against the Suns.